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Leaves are broad, thin and flat to provide a large surface area, to absorb sunlight for photosynthesis. :)
Oxygen must diffuse through the cell membranes of the alveoli in the lungs. This diffusion depends upon the concentration gradient between the air in the lungs and the dissolv…ed oxygen in the blood moving through the lung tissue. Air is only about 20% oxygen, so in order to load up the blood with oxygen, there must be lots of surface area for diffusion from the air. To allow for huge amounts of oxygenated blood be diffused from the alveoli to a capillary network. and for CO2 to travel form the blood capillary network into the alveoli. The surface area is huge because massive amounts of O2 and CO2 are diffused each minute= around 6- 10 liters. Whilst exercising you can use around 100 liters of oxygen per minute. Human lungs have a large surface area so that gas exchange can take place more efficiently and effectively. Carbon dioxide must come out of the blood and into the inspired air while oxygen must be absorbed by the blood from that air. A larger surface area means more area (more places) for gas exchange to take place. Alveoli in the lungs increase the overall surface area of the lungs, to encourage more diffusion to take place, so that a greater volume of oxygen / carbon dioxide can be transferred out of / into the lungs. it need room for oxygen to travel in an out.
In an average adult with healthy lungs we find approximately 300 million alveoli with a total surface area approaching 150 meters square, or the size of a tennis c…ourt. 70m2 The edzact size of a tennis court xxx Typically between 50 and 100 square meters 160 meters squared.
To acquire more oxygen from water as the large SA of the gills allow more water to pass through and thus more O2 from the water to transfer into the gill-bearing creature's bl…oodstream for respiration
"Gas exchange is by diffusion from the gas contents in the lungs to the blood vessels in the pulmonary aveolus. The many indentations within the lung act to increase the surfa…ce area in the volume occupied by the lungs." To improve on the previous answer, the larger the surface area compared to the volume (or size) of the cell, the faster the rate of diffusion through the cell membrane. So with a larger surface area, more particles can diffuse in and out of the cell and at a faster rate for the same volume of cell.
Plants get their chemical energy from a process know as photosynthesis. In order for this to work, plants need sunlight (ie they die if left in darkness) To maximize t…he amount of light they can absorb in their leaves, they must have a big surface area. Notice the sterm is often cylindric in shape, minimalizing the surface area in order to avoid vaporizing of precious water and to avoid falling over in storms.
It has a large surface area so it can absorb the maximum amount of sunlight.
The large surface area of the small intestine is achieved by a combination of anatomical features such as the plicae circularis, the vili, and the microvilli.
so that it will produce more energy for needed
It helps gas exchange- rate of exchange is directly proportional to area.
They have a large surface area so there is enough area for heat radiation.
Lungs have large interior surface area because they're not just big bags. On the inside, they're full of a spongy network of smaller, smaller, and ever-smaller air passage…-ways, ending in tiny dead-end sacs called alveoli. Every tube, sac, detour, fork in the road, branch, split-off, and tiny dead-end has walls with surface area. The speed at which oxygen can be transferred into the blood stream depends on the collective surface area of the alveoli contained in the lung. That is why we have alveoli, filling the lungs like a sponge. We need the oxygen collected by the bloodstream in order to burn the energy that our body has stored, and a faster input of oxygen allows a faster burning of that energy - hence the advantage of having that maximized surface area. One common result of many years' smoking is that the wall between two adjacent passage-ways shrivels up and disappears, and those two passageways merge and become one. That reduces the surface area in that tiny part of the lung. When it progresses to thousands of tiny parts of the lung, you start to notice it ... you're short of breath, because the interior surface area of your lung is reduced, and you can't grab enough of the oxygen from the air you take in. That's the condition called 'emphysema'.
Because they're flat.